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Keep __proto__ keys in whole-area browser storage reads - #18527
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teamleaderleo merged 5 commits intoOct 8, 2026
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughWhole-area local and session storage reads now preserve keys such as ChangesBrowser storage operations
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix · Severity of issue fixed: Low Suggested reviewers: Merge Risk: ⚪ Minimal · up to Whole-area storage reads and browser state save/load retain stored 🚥 Pre-merge checks | ✅ 23 | ❌ 1 | ❓ 1❌ Failed checks (1 warning, 1 inconclusive)
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Full details: Out of Scope Changes checkExplanation The pull request also changes Full details: Docstring CoverageExplanation Docstring coverage is 41.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 2 files. (1 skipped: 1 too large.)
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Review comments at
@Packages/macOS/CmuxBrowser/Sources/CmuxBrowser/Control/BrowserControlService+StorageScripts.swift:
- Around line 62-68: Update the inline readStorage function used by
browser.state.save to define each storage entry as an own enumerable property,
using the Object.defineProperty pattern already present in browser.storage.get.
This ensures a stored __proto__ key is included when the result is
JSON-stringified.
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Packages/macOS/CmuxBrowser/Sources/CmuxBrowser/Control/BrowserControlService+StorageScripts.swiftPackages/macOS/CmuxBrowser/Tests/CmuxBrowserTests/Control/BrowserControlServiceStorageScriptsTests.swift
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Co-authored-by: Cursor <cursoragent@cursor.com>
…oto__ tests Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: Cursor <cursoragent@cursor.com>
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Thank you @scs0209! :D |
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Oct 8, 2026
29661b9 gh-merge-green: allow explicit Vercel status override (manaflow-ai#18614) dd6e295 fix: preserve SSH ProxyCommand child environment (manaflow-ai#18285) f0a2bad Reject invalid Python regression-lane timeouts (manaflow-ai#18476) 3430354 Preserve PR media referenced through GitHub blob URLs (manaflow-ai#18562) 3b71b41 Reset a browser pane's selected frame and element refs when the page navigates (manaflow-ai#18577) 04e1d68 Clear force-close bypass when a confirmed close is rejected (manaflow-ai#18414) 8d86447 Treat Copilot value flags as value options when restoring (manaflow-ai#18470) f6c678a Keep __proto__ keys in whole-area browser storage reads (manaflow-ai#18527) 7e97128 Keep minimized windows in the Dock when the global hotkey reveals cmux (manaflow-ai#18533)
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Summary
cmux browser <surface> storage local get(andsession) dropped a stored__proto__key from the whole-area result, while still reportingok: true. The script built the result without[k] = st.getItem(k)on a plain object, so a__proto__key hit the inherited prototype setter and the string value was discarded.browser state savehad the samereadStorageloop, andbrowser state loadlost the key a second way: it embedded the saved storage as a JavaScript object literal, where"__proto__": "..."sets the prototype instead of creating an entry. Whole-area reads now return every key, and a__proto__entry survives astate save/state loadround trip.storage.getandstate savedefine each entry withObject.defineProperty, the same approachBrowserControlService+EvaluationScript.swiftalready uses for literal__proto__keys. The result is still a plain object, so the WebKit result conversion is unchanged.state loadparses the payload withJSON.parse, which keeps__proto__as an own key, before writing entries back.state save/state loadstorage scripts moved from inline strings inTerminalController.swiftintoBrowserControlService+StorageScripts.swift(storageSnapshotScript(),storageRestoreScript(storageLiteral:)), next to the other storage builders, so the package tests can run them. The controller now calls these builders; cookies, navigation and file I/O are untouched.Single-key reads were already correct and are untouched.
Fixes #16112
Testing
BrowserControlServiceStorageScriptsTestsruns the emitted scripts in JavaScriptCore against in-memory local and session storage fixtures holding a normal key and__proto__: whole-areastorage.getfor both areas, a single-key__proto__control,state savefor both areas, andstate loadwriting a saved__proto__entry back to both areas. The frozen whole-areastorage.getscript expectation is updated.swift test --filter BrowserControlServiceStorageScriptsTestsinPackages/macOS/CmuxBrowser, with the Command Line Tools toolchain (Swift 6.2.3), not Xcode:storage.getregression only): the whole-area test fails for both areas, e.g.{"ok":true,"value":{"regular":"local-control"}}; the other 10 pass.storage.getfix): 11/11 pass.{"local":{"regular":"local-control"},"session":{"regular":"session-control"}}and the restore test writes back onlyregular; the other 11 pass.python3 scripts/verify-local.pyon b559b43: 4/4 selected checks passed, including Swift syntax forTerminalController.swift.A review subagent ran the old and new
storage.getscripts through a real WKWebView (callAsyncJavaScriptplus the evaluation-script wrapper): before the fix__proto__is missing, after it the key survives into the Swift dictionary for both areas.Not run: the app build (so the
TerminalController.swiftcall-site change is only syntax-checked locally), app-host tests,tests_v2/test_browser_api_extended_families.py, or a livestorage get/state save/state loadagainst a tagged build.Changelog
Fixed:
cmux browser storage getwithout a key,browser state saveandbrowser state loadnow keep a stored__proto__entry in local and session storageProof
No UI change. The failing-then-passing tests above are the proof.
Checklist
Note
Medium Risk
Changes page-world scripts for storage dump/restore used by CLI and browser state persistence; behavior shifts for unusual keys but is covered by new tests.
Overview
Fixes whole-area
storage.get(andbrowser.state.savesnapshots) silently dropping a stored__proto__key by building result objects withObject.definePropertyinstead ofout[k] = …, so prototype-colliding keys stay ordinary data.Moves the inline Web Storage JS for
browser.state.save/browser.state.loadout ofTerminalControllerintoBrowserControlServiceasstorageSnapshotScript()andstorageRestoreScript(); restore now feeds the payload throughJSON.parseso a saved__proto__entry is not lost when rehydrating local/session storage.Adds JavaScriptCore tests that exercise get, snapshot, and restore against fixtures containing
__proto__keys.Reviewed by Cursor Bugbot for commit b559b43. Bugbot is set up for automated code reviews on this repo. Configure here.
Summary by CodeRabbit
__proto__, as regular data entries.